<template>
  <div>
      <nav-bar>
          <div slot="left" @click="back"><i class="el-icon-arrow-left"></i></div>
          <div slot="center" class="title">
              <div 
              class="title-item" 
              v-for="(item,index) in title" 
              :key="index"
              :class="{active:index===currentIndex}"
              @click="itemClick(index)"
              >{{item}}</div>
          </div>
      </nav-bar>
  </div>
</template>

<script>
import NavBar from 'components/common/navbar/NavBar'
export default {
    components:{
        NavBar
    },
    data(){
        return {
            title:['商品','参数','评论','推荐'],
            currentIndex:0
        }
    },
    methods:{
        itemClick(index){
            this.currentIndex=index
        },
        back(){
            this.$router.go(-1)
        }
    }
}

</script>
<style scoped>
.title{
    display:flex;
}
.title-item{
    flex:1;
    font-size: 14px;
}
.active{
    color:red;
}
</style>